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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95dc6fd59bcc3272c3c920ca41c9323af88f2a35ec809aecf3da756527d1af28' 
  AND token = '3381htZ8pP3zaWIyZiH+Ce+SgjxCsEh7JF74pBZ7D34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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