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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6cab296d71eaa9ba11e06b44549d9411a636050bfae16e10438a1141fca2475' 
  AND token = 'kr0K9HjG9E1NFTB5ciX5HMPxcCuep3j3677YkxTAuSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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