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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045a1cf3f12895cb92c7df2a29daa0990d67784becdbf823bfcba22f380521b3' 
  AND token = 'e9wIsjAizN/fKClR/3xsJEzLSHmE20BFZE2oFnMO+2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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