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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c28353b4023ad93090212202d4e7aa44fe8207e394421a934d19f9a067d7324' 
  AND token = '8yC5zPaFfgVnb4jpb/UIfJKjm4hmCR/6pyItcosI4zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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