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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1b63abe5e2af43b9a948bf8d32eeb0d43212d6bc48d87283177deb18b07ae0' 
  AND token = 'Xlhlf2jGZ9lNRs6bmcfXviVdVBYG8LwWVEP1CSnRfTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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