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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a498bfffa2b9d629849c2e613768deeb42bb13354904544ae0f657705bd02f' 
  AND token = 'QRfW+G9cCSFPq96D+4PaXMj75E70X75aK8gdfbVkVks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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