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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc1b37be84dc4401c0a168c59ffab3a97f6a4240686450431e1dea24448823a' 
  AND token = '0Y0ZwWbjitk9/7AHBSCV4spApAaUPXQ0K7ajU+sKfMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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