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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16116ef672fda5bee77f049ebf4a036ee82e1eb802bd51004fdd5742fa6f1f6f' 
  AND token = 'urkWPXt8MgNKvIGKMoWYRdiP5IQ088ls9Jnacj3yUEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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