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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6579d04340578799c3aefa2e00faf7f2e82db785a436c0a7b8ff666d57df50' 
  AND token = 'i4ykq7j46KMYU5LOAqjpXPypSMgervD7k55YHR3N6L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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