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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a48d7c26e11f0d4ac74f12a5ccc92ad8dc5c391f4220574ef4304bb76de3b9f' 
  AND token = '3R6YXHsiq1y4LfhZH+cnDRXcqRznwdDbpyvxpYrGq1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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