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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f97de5f5307cf001a60aafde44d6129d08fd02fc578c56eb57d50ef44a64ed' 
  AND token = '1/WFo1dMwIk669QVLjGFnsM/2zKN/QX15R3jm4THgiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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