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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1720b071c9f522861507d87aed960d7451333544b14a7de0c44793b3da2be533' 
  AND token = 'CoNCHgz+WJETUGzUef+J66Sqtlp72dp/flMBFR+NQio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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