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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49e91d7c6b81e515009c68dd9d6707105ae6b3a9b37aeed91c0fc4e0944e0da7' 
  AND token = 'V28EJ9PK37zeK8UPvjkxzN29rwLUH8j/01yxlpZPoZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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