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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495b13e599fa88b88d98eedb73d34baeccceb933d990c2fc2befb6ea01c12719' 
  AND token = 'JJpAyTymBxwNq07DUmkJGTyQsaMbJ8JqaQ2BEaT5nR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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