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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08f90c3c65d770858c568eb4133801c45d5613a989412fb9b6a7ebc9a62b0cd' 
  AND token = 'XyDNWtRt23QwWZL0E7/YtCPAREA4PxG2A61+Nn0rxz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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