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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7699986a1b14d9accb8b0cc646ddbaafc5c932822dd8db2a3f637660d93aebb' 
  AND token = '9lUIwOVbOcVH/dW9dwukSaHU+RCL4Kso/zrX1WumFSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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