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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c2871263b8ddbd8601ba64f1697c87ed32d114a84c7e9089fd0d6c92e9f3cb' 
  AND token = 'n9F0ToEFmwF9744Ol+yb0be+BFOYzX4PBHUDWGuE4Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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