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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37734e717dcdf26cdda8ad6d6ed5593e93ef409d0061ab7cbb4b09529efc72a' 
  AND token = 'NoUYyktQ9EQcY1pnYBmLa3Ag2Ye4/1f02bbtsfA2kZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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