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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a593b5f2c58cd3bd51e5ae4d4310a5f90e0d2ffb7578bfc3919b58c36aec3c0d' 
  AND token = 'QCH2Z+LnxqYbViU3qA0Pbype4uyZJo3xDVAq2Hu276A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}