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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7cd48793e50bda9b04d29b08038943345043e3c591cf3d8ef88ea7f1792c2f0' 
  AND token = 'ZWcsAzM/1rwBp/QLeaoKT/NRgw7K4fxq5K4zrNWTeY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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