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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6faec5a13ea50c5012ec715ba93a3bca6efe43562b085be3b6ef4126f0900a' 
  AND token = 'spFfIHexC/77fnWaui4gLSdiFKV6j0nslyHu/RJ3q5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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