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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a75f3ba277c247db7097fd9affd6a93cf41bfd05e88ea548776c3538b56df4' 
  AND token = 'r3d6U+Ph6d4W94PrHVNyu+J6foI6PUKCLg0C2eO5rQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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