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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da25e0f7fd01b176be85afc1a58c1c7e4b63be3b19b7859de2e859b8e3663bea' 
  AND token = 'OEKky+LrQ4r7lrcAemgYXEzZQxrQz8rSBu6fudSj3vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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