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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72b4c219230061537a129f83220fbf0fe64ec852762a93f5e6513092c3ff942' 
  AND token = 'YcxGwuknSHfW8j4CkV5oGW31zP6Y33cVNw5qS51e5Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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