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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906670a4b306342677b06e045eb0bdd4f1b18046e90e7a390ad7898b4e06614b' 
  AND token = 'XCxbP4Ei1A0Kls8AZYCe4FtFNfjJCDdq52bK61V/UZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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