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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba1792701c51da0acde8d2c471fb7cae9284fb10306ed662eb99659ae3ff9b0' 
  AND token = '2c53SV+hBq8ennL8JwpMkiSS/06Uita81DRBa1FWqWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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