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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7bbd8aac20e358d4988f54f948745828fb206b5f0ae66526cb990bff03c247' 
  AND token = 'wGq/p7o5i8bgTbWZODrydJspNIyMq0aTkfDHbPehwzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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