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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fda4133f6fee85713d7f930b26becd9c0dae1b96815b7c18c8a0da6d17afd74' 
  AND token = 'tojd2+1lEaeSAl2pGpODG7Htu0h3KPvoe0u8CxidxWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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