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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a13b27a808934ae31f4a6f5c8b315970212ca7df7f97af9a3fc4745470aef7a' 
  AND token = 'vIG4un7UuJ/w4cdkzoXenv7U+As/FF0j1OEa6Mn9cGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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