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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6c2bcc83c670b35f3cd3a222036a63f539b2a4ccd895ed086b35a5f8fe4eae' 
  AND token = 'h9IvR4EMo5GHlLmKDaSZ0iH3gn06la52dYJYs/++JgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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