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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0973c8586b2f844031b42519af47e280c6a663188b7b64f90c28c4e36a2792b' 
  AND token = 'SJ6CGqYrRP5l6Ix1E1xuDMQg1wTC302m3fe285KKQqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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