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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15917126e4949bf57e61d3643248d81db81166e6f4462d5c766fec44393914fb' 
  AND token = 'dvE8469k/dz71tJxsb1eTaye1C1qFjQiGAkeBqm3e6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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