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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41685a582f47c2a0f74a6700e4353bbdfa4c917e0c3f24617b8b23349d8f3699' 
  AND token = 'AhQmEIe0Ih2h0TKQWWRkDQnteOfjB3cGV48RdLbMqLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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