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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4415105fc6fa0faf54ead6bdfa68668c590bb4ef696ad322709540c8ca11bd0' 
  AND token = 'mleHR5sDw6/aXhGQcHTM4M1CywHfIAEcQP7qs14S9qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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