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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e68d77561e9b089d09cf69aa6070285b88c5caf8f60a3888b6c34173d5af6c0' 
  AND token = 'bbK4JF+kWrv7Js6frgNa+ucLTRKPV0c1n9zo8tJyFo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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