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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f3d0b82015e599eb3d8400f0b652f4fb9afd32905ae8668587e9a3b4f920d4' 
  AND token = 'kjcsbh4WAa/4kUMgTaeMAAXcqocv8AqL1C97LXOPcZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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