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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b18b5e3a1a73d43e40ced87bcae875205aecee4918fe26c2ff211fe25e72d56' 
  AND token = 'MCvaMSAjSX9c9AnkGPIXXJF19y5Fn6q/Hgg2ErOxbQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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