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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2608789323f76b754235bee888574d638b6bc819ade94e9d12b7e7b4bfb5d5' 
  AND token = 'XuiVLlQtbIHqQur4t77TkNakqPXPFmlyGkEfyiRTzuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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