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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98e49feb98fe022abfd8e02bf17a1127b41ec9a2d71b176c639e3f887ad84da' 
  AND token = 'XkB/BxT2D7h5gYelZywNuMEsOKB7tFKPf0pbpCjpl7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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