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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de56e4d534214e73ab414068d5dbe2a151d35e18180ed0f46dcf3d409a4ba9a2' 
  AND token = 'YmB30sXrP2sme9DwIEE0JNaZZvw2yzodjHONWqI53jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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