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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76593b7050d666470319dd633061b1cb802c53dfb84e4c42f656bd1a386955aa' 
  AND token = '2e1RKf6YbPpCcOMXuE+Sl3cjCBrvdJKHJSeg7WW9ul4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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