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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840463439b3a9af3a20baa3e594480a739e53af1ba7deaf6b9ba46c584b01845' 
  AND token = 'u0PNf2N4kcO6PybzkWSscd1ttg682wI6Lh98VlzuVOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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