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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf3348afe2bb7775b08e30d4843a883674cff79ef2a7fddea0391ba031825db' 
  AND token = '2jYs2+asLGzL2u4TokkIAe/Fa7UdoeZIP0vmlOy5XXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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