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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48ce3552b036c2acb555740bf7fb3ab48c8fb4db284adbcbec91db836abb1e7' 
  AND token = 'KJ2BSANQ6082yueSKKVo9YwKV0myOFAVI09Gh/fmQLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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