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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91271d6e0be75b4bafa033430527a6ee52423695a08cec6adb0a8f925b235519' 
  AND token = 'ZKzzXGHYEAiCRYluom1pp5m3PZn4a8hYbkryhvPOT5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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