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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbe0f47cac8fac79d68652449c039af8ce026c5890d59aacf01ea3ae0234686' 
  AND token = 'o6Wb643ZIkOGoYs6VMbnTcn5D2qarvjGDwL9qUgFK2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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