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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f2b7b3c544ead057ba9b2e90c6c3241c9fe0c2cd8b648b50bf88a2c804b775' 
  AND token = 'X6hq0GK1ZPJuddfdSH9tBZTWPyuVxYydNrng1Da3ZTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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