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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6010764e11590e1780980963b8719762f771e06d3a3a9fcca3416b70746855' 
  AND token = 'CsdwAtK7QVLM1Qf1EhgT6K7L8OthqHm3ENQ33mFs760=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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