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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249a87090e1db2930bf9b04543d01685190fa2eb251e24425a3771050d86de06' 
  AND token = 'RfEzPRq1MFc5X11kbeddEMA2todQOFvkzjXRH1xz4uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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