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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c9c66ba0bd439d688da035bee2a584a0fe09ecd18b036092e5ad842125231b' 
  AND token = 'TLwl9aVbKkRfFf08mZOf3wHHs8d0A2DGFXb+Wiw9hJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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