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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f0aee1dd693592f9af55fb17d0e19cc5077a42af5b7a7aae1e9e35fcb65ae0' 
  AND token = 'IXkTAHKvaNYrFFWOrLTjujtXKVPtK3nnjN+rAC67JH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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