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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56f496ee4f7311fe08f559e16c63f379d790c0dc413a7fb10888b4b0424131d' 
  AND token = 'i1OVh8oNZcdo82MVFBlW8FGt52+vgIaPbCZSjC17PqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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