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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad5257da719a50c98313be2ccb9e1275d9740783edecfb5711510f8e328fb34' 
  AND token = 'M9FTbhKm3AKCMAiNlGA1/Rd97iDVn7g5KPqh8jYPBQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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