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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05291104f42f29124e7ff8f1a33edca57e6e43eaf901ec88adf8640273567344' 
  AND token = 'x/y2u7zjQNfsboHiEXegbQOKi7YHD25cfvwC6D54aDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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