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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cec75d03e800a9f6d7f9eb5c91bb70ba1e05f4d38c7372900dd417ffacb5bf6' 
  AND token = 'oZRVDfVte0aSGgrNWF2K9CE1FyP3LkRHrCvbV5CqcBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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