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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e5ba4a18a2f5711658a81b758c60d8e81cf03b7e9cece0b82ea4842038d9fd' 
  AND token = 'Zcy32cID8M4Y1lVThFYl4gO6hnaJyanJbFzyczQZQX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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