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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936285d72a9e658eda3aa4b865ef41d45d7dc28b04f4daf375ee8d76658bf167' 
  AND token = 'W/dYOevRAoxJRerHbww6xZPrwauZ1L/Yib801JMfTlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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