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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9ca58c542fb7b75f386518fd7a5862e4e32c32e7e93802a7bdfacff206445a' 
  AND token = 'U54ncJpgtsijAmna5qhZ01W1Iyk+JE/wQQ97BMHh9TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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