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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc065657624e08af09b67fb0b3d6926ec95a8feafb5e06bf6cea2ec07db26725' 
  AND token = 'NJ0kwhkLDKzFxIo6gfjFukFZPl+kGuXqNJ3sPE/KaTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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