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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd003a776ecda178ed6dc4f5a0458400e309d989577566dfdbe580625519e54' 
  AND token = '4pTvdDg2BNAjvYwmWHFPacjlAkIjP4Bo8TqX7A4PDP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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