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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c03d62aaaabaf060079d2d8727a1311dd7bc19a261cbd6f5bba9fa83c0d6f3a' 
  AND token = 'iKJBb5YPps0Bf9wdJ0XlyIlD98VaqZpR6lNbieYt7FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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