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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee3d6b1f12b47e8a354ad2765af3369cafa0412cf17bb82721a14181844dd4c' 
  AND token = 'ZSOf2U1xT2zXn/r1RLNYLXoogUBlUHCM5iEKW3wCed0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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